Blower.



B. G. WILEY.

BLOWER.

APPLICATION FILED 0012.4, 1909. 1,050,892, Patented Jan. 21, 1913. rMums-sna l.

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B. C. WILEY.

BLOWER.

APPLICATION FILED OUT. 4, 1909.

Patented Jan. 21, 1913;

2 SHEETS-SHEET 2.

IZNESSES orrrcn.

' EDGAR C. WILEY, OF LYNQHBUBJG, VIRGINIA.

Browne.

Specification .f' Letters Patent. t t 5 ,2 191 Application filed October4; 1909. Serial No. 520,818.

To all whom it may concern:

Beit known that I, EDGAR CLARENCE WI- LEY, a citizen of the UnitedStates, residing at Lynchburg, in the county of Campbell and State ofVirginia, have invented. cerers, of which the following is aspecification. My present invention relates to steam blowers forfurnishing artificial draft to g nipple 10.forming the shell of rimarynoz:

furnaces and the like, and resides particularly in an improvedcontrolling valve therefor.

The essential feature of my device isthe I use of a secondary valve inconjunction with a steam valve controlling piston, the said secondaryvalve being so arranged as to adrnit steam at low pressures to the steamvalve; controlling piston as the boiler pressure varies. By thusoperating this valve controlling piston at a low pressure, I am enabled,as will hereinafter become more apparent, to secure a wider range ofmovement of the steam controlling valve from a given fluctuation ofboiler pressure than could be had were said fluctuation of said boilerpres.- sure allowed to act directly upon said steam valve controllingpiston.

With this general statement of the purpose and principle of the device,I will now proceed to a detailed description of the mechanism, referencebeing bad by numeral to the accompanying drawings, wherein,

Figure 1 is an elevation, partly sectional, of a boiler setting andgrate with my improved blower mechanism applied; and Fig.

2 is a transverse section of the controlling mechanism, the plane ofsection being taken through the center line of the device.

Referrin to the drawings, 1 represents the boiler s ell; 2 the boilersetting; and 3 the grate. These parts may be of any approvedconstruction and are shown merely betterto illustrate the mode of.applying the blower.

Projecting into the ash pit 4 is the blower tube or draft tube 5, whichis embedded in the brick work of the setting 2. Near the outer end ofthe draft tube is the nozzle which directs the steam jet. This comprisesa restricted primary nozzle 11, discharging a jet of steam into thelongitudinal passage 6? of a secondary nozzle 6. Leading into 5 relativepositions.

this passage 6*- are lateral openings 6,

through which air is drawn into the secondary nozzle by the steam jetleaving the primary nozzle, so that a mixture of steam and air isdischarged from the secondary tain new and useful Improvements in Blow-?nozzle 6. This results in a larger jet, and

induces a greater flow of air through the Z blower tube.

The secondary nozzle 6 is screwed onto a zle 11, so that the two are he(1 in proper upon the body of a tubular casting 7, which receives steamfrom the boiler through a ,pipe 8. The casting 7 also serves as asupport for the nozzle and its valve mechanism, being threaded at 9 intothe shell 5.

The prlmary nozzle 11, together with a The nipple 10 is formed taperingvalve rod 12" which is movable longitudinally through the nozzleorifice, forms a steam-controlling valve, the opening of Y the orificebeing restricted as the valve is moved to the left. The rod 12 is guidedby a sleeve-bearing 13 in the casting 7 with which the rod makes asliding and approximately steam tight joint. The rod 12 terminates inthe piston 14, which slides in a cylinder 15 formed integrally with thecasting 7. The rod 12 and its attached piston 14 are urged to the rightb a spring 16 coiled about the rod 12, and hearing against the casting7, as shown. The movement of the rod 12 to the left is limited by theshoulder 17 which abuts against the casting 7. This is to prevent thetapered portionof the rod from sticking in the steam orifice of theprimary nozzle 11 in case the rod were forced strongly to the left. Theshoulder 17 is so positioned as to allow tight closure of the.

primary nozzle 11 by the rod 12. The space to the left of piston 14 isvented at 18 to relieve any pressure due to leakage past the bearing 13or iston 14. The passage in casting 7 is drained by a pipe 19 to a draincook 20, to remove an condensed steam, and a pi 21 provided with a cock22 serves as a simi ar drain for the right end of cylinder 15. The rightend of cylinder 15 is closed by a screw plug or cylinder head 23, whichvmakes a steam tight joint with the cylinder walls. I I

Threaded in cylinder head 23 is a rod 24 which serves as an adjustableabutment to limit. the movement of piston 14 and its atis provided witha knurled head 25 and a jam nut 26, so that it may be readily. adjustedand locked in position.

The piston 14 makes a rather loose fit-1n the cylinder 15, so that theremay be a slight leakage.- of. steam past the piston. It is obvi-.

ous that an increase of ressure in the cylinder 15 will tend to 'orcethe piston 14 and its attached valve rod 12 to the left, thus reducingthe opening in primary nozzle 11, while similarly a reduction inpressure causes movement to the right, and consequently opens theprimary nozzle I 11. Spring 16 is of such strength that it allows thepiston 14 to move through its entire range when the pressure in 15'fluctuates through the range of variation allowed in the boilerpressure; that is, if the boiler pressure may fluctuate five pounds thepiston 14 -will move throughout itsent-ire range when the pressure incylinder 15 rises from zero pounds to five pounds gage.

Itv now remains to describe a mecha-nism which will cause the existenceof approximately one pound pressure in the cylinder 15 for each poundthe boiler pressure rises abovethe desired minimum.

27 is a small pipe bringing steam from the boiler. 'It is screwed into.a casting 28 which forms a seat for a valve 29 located in the casting 30also screwed to castings 28. This casting 30 is connected by a pipe'31to the cylinder 15. The valve 29 is held upon its seat by a spring 32,and the load upon this spring is'so adjusted that the valve29 is held toits seat against the minimum pres-- sure desired to exist in the boiler,but when this pressure is exceeded the valve 29 will be forced from itsseat against the springs action, thus admitting steam to the casting 30,whence it will pass through the pipe 31 to the cylinder 15. The load onspring 32 is adjusted by means of a rod 33 threaded in casting 30, andcarrying a swive'led block 35 bearing against the end of spring 32. Aknurled head 34 mounted on the rod 33 serves as a means for turning therod to adjust the spring.

The operation of the device is as follows: Let us assume that thedesired average pressure for the boiler is 100 pounds, and that amaximum fluctuation of five pounds may be allowed. In this case thespring 16 would be so chosen that the piston 14 would move through itsentire range for a variation of five pounds, and the spring 32 would beso adjusted that valve 29 would be lifted from its seat at a pressure of97% pounds. As-

. suming the pressure in the boiler to be below 97% pounds and to berising, it is obvious that valve29 will be closed, and that due to theleakage past piston 14 there-will be a pressure of zero pounds gage inthe cylinder 15. As the pressure in the bOllGl'yhOWBVGI, rises andexceeds 971}. pounds, the valve 29 will be liftedv from its seat andsteam will flow into casting 30, and by pipe 31 to cylinder 15.Conversely, as the boiler pressure falls, the decreased tendency to openvalve 29 will cause this valve either to close, or to tend to close. Theleakage past the piston 14, aided by the condensation of steam in thecylinder 15, will quickly reduce the pressure in this cylinder to theappropriate amount. It has been found that the above mentioned leakageand condensation are suflicient to se cure the necessary reductions inpressure;

It has been found by experiment that each pound. increase above pressurenecessary to open valve 29 will cause approximately a' correspondingpound increase of pressure in pipe 31, and cylinder 15, the increasedpressure in casting 3O assisting in closing valve 29 as soon as thisincreased pressure is established. Asthe pressure in cylinder 15increases, the'piston 14 is forced to /the left, its movement beingapproximately proportional to the increase in pressure. Thus as .theboiler pressure rises the opening of primary nozzle 11 is reduced, andthe flow of steam to the blower consequently restricted:

Hence the blowing action is diminished, and less draft is supplied tothe furnace. It is entirely feasible to have a fluctuation of fivepounds in the cylinder 15 move the valvestem longitudinally s of aninch. This considerable range of motion permits a very nice adjustmentof the orifice, and consequently a gradual-fluctuation of thebloweraction with fluctuations in boiler pressure.

In most devices heretofore constructed the boiler pressure has beencaused to act directly upon a regulating device, as for instance adamper regulator connected to a throttle on the blower steam pipe. Here,however, the spring or equivalent mecha: nism opposing the steampressure, must be sufliciently strong to overcome the entire boilerpressure, and consequently the movementfof the apparatus for afluctuation of five pounds is very slight. Any nice regulation of theblower action by such device is therefore impossible, and the blower ismerely turned on and oil as the pressure fluctuates past a certain setpoint. This action is most unsatisfactory, and is avoided by myinvention.

V In the practical operation of my device the blower intensity isadjusted to the de-- mands for steam'made upon the boiler, the blowertending to maintain a practically uniform pressure in the boiler by apractically continuous operation of the blower. The intensity of theblowing, however, va-

the blower action is not intermittent, but I steam is regulated by avalve interposed in the pipe leading to the orifice.

The use of a primary and a secondary nozzle increases the efliciency ofthe device, but the controlling mechanism will function in the mannerdescribed regardless of the type of nozzle used.

In the above description I have called attention to the fact that-slight leakage is allowed to occur past the piston 14. It is notessential that this leakage should occur at this point, as any othermeans for accomplishing the purpose of gradually bleeding pressure fromthe right end of cylinder 15 will accomplish the same result, and causethe device to function in the identical manner. It seems probable thatthere is a slight flow of steam constantly past valve 29 when pressureexists in the right end of cylinder 15, but this flow, if it occurs, isvery slight.

In the claims, I shall use the term excess pressure valve to designateany valve that performs the function of valve 29; z. 6., creates apressure on its low side equal approximately to the excess of boilerpressure above the desired minimum.

Having thus described my invention, what I claim is 1. The combinationof a boiler; a furnace; a draft tube adapted to furnish air to saidfurnace; a nozzle having a discharge orifice standing in line with saiddraft tube; connections for supplying an expansible fluid under pressureto said nozzle; a movable nozzle-valve member adapted to vary the areaof said orifice; a piston connected with said nozzle-valve member tomove the same; a spring held valve connected wit-h the boiler andadapted to admit steam at reduced pressure against one face of thepiston to urge the nozzle-valve in a closing direction; means forgradually venting such steam pressure from said piston face; and aspring opposing the closing movement of the nozzle-valvev member. 7

2. The combination of a boiler; a furnace;

a draft-tube adapted to furnish air to said furnace; a nozzle having anorifice standing in line with said draft tube; connections for supplyingan expansible fluid under pressure to said nozzle; a movable nozzlevalve mem- 'ber adapted to vary the area of said orifice;

a piston connected with said nozzle valve member to move the same; anexcess pressure valve adapted to open under boiler pressure to admitsteam from the boiler against one face of the piston to urge the nozzlevalve member in a closing direction;

furnace; a nozzle having an orifice standing in line with salddraft-tube; connectlons for supplying an expansible fluid under ressureto said nozzle; a conical valve mem or amally movable through saiddischarge orifice to vary the area thereof; an adjustable stop adaptedto limit the opening movement of the nozzle valve member; a pistonconnected.

with said conical valve member to move the same; an excess pressurevalve adapted to open under boiler pressure 'to admit steam from theboiler against one face of (the piston to urge the conical valve memberin a closing direction; a spring adapted to urge said excess pressurevalve in a closing direction; mechanism for adjusting the stress on thespring; means for slowly venting pressure from the piston face; and asecond spring adapted to oppose closing movement of the conical valvemember.

4. The combination of a boiler; a furnace; a draft tube adapted tofurnish air to said furnace; a nozzle having an orifice-standing in linewith said draft'tube; connections for supplying an expansible fluidunder pressure to said nozzle; a valve adapted to control the flow ofsuch fluid through said nozzle; a piston operatively connected withvsaid valve; an excess pressure valve adapted to open under boilerpressure to admit steam from the boiler to one side of said piston tomove the first named valve in a closing direction; a spring adapted tourge the excess pressure valve in a closing direction; means for slowlyventing pressure from said piston; and a spring adapted to oppose theclosing movement of the first named valve.

5. The combination of a boiler; a furnace; a draft tube adapted tofurnish air to said furnace; a nozzle having an orifice standing in linewith said draft tube; connections for supplying an expansible fluidunder pressure to said nozzle; a valve adapted to control the flow ofsuch fluid through said nozzle; a piston operatively connected with saidvalve; an excess pressure valve adapted to open under boiler pressure toadmit steam from the boiler to. one side of said piston to move thefirst named valve in a closing direction; a spring adapted to urge theexirection; means for g, I 1,050,592 v means for adjusting the stress insaid. two subscribing witnesses. spring; means for slowly ventingpressure from-said. piston; and a. spring adapted to li'oppose theclosing movement of the first Witnesses: v named valve. I KATIEJENNINGS,

- In testimony whereof I have signed my GRACE H. Mmoon.

, cess pressure valve in s) closing direction; name to thisspecification in'the presence of EDGAR CLWILEY. Q

